Various recommended online or bibliographic resources for those who want to dabble in creating constructed languages.
IPA (International Phonetic Alphabet) - Very useful for every “conlanger”.
Proto-Indo-European roots - Very handy when trying to determine what roots your conlang “should” have.
Mark Rosenfelder's Language Construction Kit
Numbers from 1 to 10 in over 5000 languages
A list of conlang links and resources, courtesy of Osakadave
A list of conlang threads on AH.com